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Delete all lines except a line starting with string

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# 1  
Old 04-18-2018
Delete all lines except a line starting with string
Shell : bash
OS : RHEL 6.8

I have a file like below.

Code:
$ cat pattern.txt
hello
txt1
txt2
txt3
some other text
txt4

I want to remove all lines in this file except the ones starting with txt . How can I do this ?
# 2  
Old 04-18-2018
gnu?
Code:
sed -i '/^txt/!d' pattern.txt

# 3  
Old 04-18-2018
Hi,

You could try;

Code:
cat pattern.txt | sed '/^txt/!d'

Regards

Gull04
# 4  
Old 04-18-2018
Code:
grep '^txt' pattern.txt

# 5  
Old 04-19-2018
Code:
grep -v '^txt' yourfile >file_without_txt

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